package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.beans.BeanUtils;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private SetmealMapper setmealMapper;





   /**
    * 添加购物车
    * @param shoppingCartDTO
    */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {

        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        // 这样设置是为了让用户只能查询到自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        //判断当前商品是否在购物车中
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        
        if(shoppingCartList != null && shoppingCartList.size() == 1){
            //如果存在 则更新数量  数量加1
            shoppingCart = shoppingCartList.get(0);// 由于购物车列表中只可能存在一个商品 所以直接取第一个 这里使用list是因为可能存在多个商品
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.updateById(shoppingCart);
        }else{
            //如果不存在 插入数据 数量就是1

            //判断当前添加到购物车的是菜品还是套餐
            Long dishId = shoppingCart.getDishId();
            if(dishId != null){
                //添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else{
                //添加到购物车的是套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCart.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        // 获取当前用户的ID
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        return shoppingCartList;
    }

    /**
     * 清空购物车
     */
    public void cleanShoppingCart() {
        //获取当前用户的ID
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);

    }

    
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);

        //设置查询条件，查询当前登录用户的购物车数据
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);

        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);

        if(shoppingCartList != null && shoppingCartList.size() > 0){
            shoppingCart = shoppingCartList.get(0);
            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else{
                //当前商品在购物车中的份数大于1，则更新份数
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateById(shoppingCart);
            }
        }
    }
}
